TELLING you what suspension to get is like telling you which set of heads to get. Each has their own merrit, and they each have their pros/cons...
I personally have my own built t-arm/panhard suspension, so I am partial to the Griggs units.
Other local Ford employees actually developed the Steeda 5-link, and I run with them at the local track...
[36Meg video]
http://www.dariusrudis.com/videos/foursome.asf
Its a matter of personal preferance, and its sounds like you are leaning to Steeda. Go for it, you wont be disappointed!